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The story of BPS revolves around a "freelance programmer" named Akira Shirase. He's a very talented, yet mysterious computer programmer. Because of his incredible abilities, he's contacted by several individuals (curiously, all of them are very similar persons named Akizuki Kaoru) to do all sorts of strange computer-related hacking/security jobs. He's a very quiet guy who lives alone in a small apartment near his niece's house. At first, the episodes revolved around some freelance jobs that highlighted his abilities - however, later on in the series, characters came back and offered help or plot twists. The school that Shirase had gone to had been hinted throughout the series, and it finally made an appearance in the last episode, when some of the characters began to show their hidden relationships to the others. However, the series was not continued.

He's the main character of the story. Akira is a very talented computer connoisseur and is known in the hacking world as Battle Programmer Shirase (which is typically shortened to BPS). A genius in computer hacking and security who can do anything on any computer, or phone.

Misao is Akira's great-niece. She is a very shy girl who loves to spend her time with Akira, whom she often refers to as onii-chan (お兄ちゃん?). She cares for him deeply and it's very common to see her cooking for him or worrying about him. Sometimes, Misao says mau-mau (まうまう?), which doesn't have an actual meaning (this may be a "cute" form of speech the creators added for her to please fans of cute anime girls). Misao looks very young for a 6th grader.
Misao Amano has made a cameo appearance in the final OVA of (Dual! Parallel Trouble Adventure) and is a main character in the series (Magical Girl Pretty Sammy) in which her alter ego is Pixy Misa.

Yoriko is a girl who works for the United States Navy. Her rank is Major Yoriko Yunoki. She first meets BPS (Akira) when he is seen walking home after waiting in front of a book store. He explains that the book store clerk only opens when he wants to. She had been following Misao and asked if she could go to her house. She seems to have the same knowledge of computers as Akira and in one episode asks him to join her in the National Guard as her partner. She also asks him to go to America with her, and seems to have strong feelings for Akira as well.

Sae is Misao's teacher. In an earlier episode she had tried to get Misao together with a boy from grade class. She is later seen drinking in an alley where she meets Akira, whom she hasn't seen since high school. She was being forced to have a marriage interview, and since she didn't want to go she ended up getting drunk in the alley.

The final episode of the show made the unusual step of explicitly apologizing for ending the series, not only the local Japanese viewers, but also those in the fansub community: It was addressed to "those who enjoy the show on TV, and to those outside the broadcast area who took special measures to watch the show on their PC monitors, and to everyone who watched it subtitled overseas without permission."[2]